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Manual-5

OPERATING INSTRUCTIONS

The MQ 302 is an accurate, professional quality instru-

ment capable of precise equalization down to a fraction of a
dB. You can expect several advantages from your constant-Q
equalizer over conventional designs: Moving one slider will
not affect neighboring filters as much, so you won’t spend
time re-adjusting sliders (we call this “equalizing the equal-
izer”). You’ll be able to obtain better feedback control
without losing sound quality. All sliders maintain smooth,
consistent and accurate calibrated control over filter levels,
which is especially critical in low-profile equalizer designs.
Because of this, the overall EQ adjustment process is signifi-
cantly easier and more effective.

Equalizing a sound system by ear is a 

very

 difficult

process to achieve successfully, especially in a timely
manner. Although the human ear is very sensitive, it is 

not

calibrated, nor consistent, and frankly the odds 

against 

a well

behaved, clear sound system are very great when tuned by
ear. Most people know when a sound system doesn’t sound
good, unfortunately they just can’t tell exactly 

why

 and 

where

it’s not right. 

Because of this, we strongly recommend the

use of a realtime analyzer to properly equalizer your system
with the MQ 302.

Forget everything you’ve thought about analyzers and

consider this: there’s a newer generation of analyzers which
are compact, simple, very easy to operate and surprisingly
affordable. Best of all, they can make a drastic improvement
in the overall performance of your sound system while saving

you a great deal of time and effort.

A realtime analyzer helps you quickly achieve things

nearly impossible by ear: flatten speaker response, minimize
feedback, remove room resonance and allows accurate
crossover alignment. In most cases, simply “normalizing” or
“flattening” a sound system is a surprisingly drastic improve-
ment, but 

don’t stop there

:

Remember this Rane proverb: “Look, don’t stop, and

listen.” Once you have aligned the system by 

looking 

at the

analyzer, 

don’t stop 

at this point. 

Listen 

to the music

program and make additional adjustments to suit your taste,
the type of music and your audience. Fatten the bass, sweeten
the highs, brighten the mids. Since you are starting from a
“tuned” system, your ear will not be fooled into thinking bass
is too high when actually mids are too low, or that highs are
too weak when really the mids are too strong.

Fact: analyzers don’t have good taste—people do.

Analyzers consistently and accurately “tell it like it is,” but
ultimately, personal judgment determines what sounds good
or appropriate. In fact, final optimum EQ settings, made 

after

analyzer testing, will vary greatly depending on the type of
music, sound pressure level, size of the venue and disposition
of the audience.

Conclusion: 

To consistently obtain the best sound from

your system, use an analyzer and then your ears, in that
order.

 The analyzer supplies the consistency and calibration

while your ear supplies the good taste.

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Figure 1. Stereo Biamp System with Equalizer

Summary of Contents for MQ 302

Page 1: ...y Begin by setting all sliders to their center detent 0 dB and the INPUT LEVEL to 8 Try to make more cuts than boosts After equalizing use the EQ switch to compare equalized and non equalized signal While EQ is switched to ACTIVE out adjust the INPUT LEVEL to the same level as when EQ is switched to BYPASS in You may use either the XLR or connectors for Inputs or Outputs Connect only one INPUT typ...

Page 2: ...se sliders controls the output level of both Channels of the 30 bandpass filters Center position is grounded for guaranteed flat response Cable Wiring In agreement with IEC and AES ANSI standards XLR wiring convention is pin 2 Positive hot pin 3 Negative cold and pin 1 Signal ground for unbalanced use Pin 1 and the connector case or shell are tied to chassis ground INPUT LEVEL control This control...

Page 3: ... TS jacks Using both types of Outputs are permissible to drive two devices such as an amplifier and a recorder LEFT RIGHT INPUTS Choose between the balanced XLR or the balanced unbalanced TRS jacks but only use one Inserting a TS jack will work however always use balanced lines especially when connecting cables over 10 feet in length Consult SOUND SYTEM INTERCONNECTION on page Manual 8 ...

Page 4: ...thing the equalizer slider settings will change with each new location which in turn affects the control voltage and threshold responses of the compressor and renders it inconsistent Secondly healthy amounts of boost often strains the dynamic range of compressors and increases the danger of distortion and or overload UPSTREAM OF THE LIMITER If a limiter is installed strictly to protect the drivers...

Page 5: ... improvement in the overall performance of your sound system while saving you a great deal of time and effort A realtime analyzer helps you quickly achieve things nearly impossible by ear flatten speaker response minimize feedback remove room resonance and allows accurate crossover alignment In most cases simply normalizing or flattening a sound system is a surprisingly drastic improve ment but do...

Page 6: ...oint for measuring voltage levels Usually a large conducting body such as the earth or an electric circuit connected to the earth Chassis should always be at earth potential WARNING SHOCK HAZARD Never use an AC line cord ground lift adapter or cut off the 3rd pin It is illegal and dangerous headroom The level in dB between the typical operating level and clipping For example a nominal 4 dBu system...

Page 7: ...ilters Yes Frequency Response 20 20 kHz 0 2 dB THD Noise 0 009 002 4 dBu 20 20 kHz IM Distortion SMPTE 0 005 003 60 Hz 7 kHz 4 1 4 dBu Signal to Noise Ratio 20 kHz noise BW balanced out re 4 dBu 96 2 dBr Sliders centered re 4 dBu 20 kHz BW 76 2 dBr Sliders all boosted re 4 dBu 20 kHz BW 91 2 dBr Sliders all cut re 4 dBu 20 kHz BW Channel Separation 80 3 dB 1 kHz Common Mode Rejection 40 1 dB 1 kHz...

Page 8: ...though this assumes the interconnected equipment is internally grounded properly Since most equipment is not internally grounded properly connecting both ends of the shield is not often practiced since doing so can create noisy interconnections A common solution to these noisy hum and buzz problems involves disconnecting one end of the shield even though one can not buy off the shelf cables with t...

Page 9: ...Manual 9 VARIOUS XLR CABLE ASSEMBLIES ...

Page 10: ...al 10 All features specifications subject to change without notice MAR98 Rane Corporation 10802 47th Ave W Mukilteo WA 98275 5098 TEL 425 355 6000 FAX 425 347 7757 WEB http www rane com MQ 302 BLOCK DIAGRAM ...

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